Multihulls love bridles, but going out on the skinny amas of a trimaran to rig that bridle is uninviting if there is any chop. Thus, I leave mine rigged but retracted.
The line is over-size Dyneema; about 15x maximum working load, including allowance for single leg loading. The normal load factor for Dyneema would be about 4x, so this allows me to loose 75% strength to UV and wear before reaching the WLL. That should take over 10 years, based on available desert testing. This also squares with my personal experience with old Dyneema.
When not in use, they are pulled back to mid-tramp by a Davis Instruments Mini-Shockle (a very heavy duty bungee). The front end is secured to the pulpit with a carabiner.
To deploy, the Shockles are released and the carbiners are clipped to a prusik sling.
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To learn more about anchoring with rope, visit Practical Sailor Magazine. This last image is from and up-coming series on anchoring without chain.
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